Not sure a circular polarizer would make any difference - as I
understand it, it's a linear polarizer with a quarter-wave slice of
glass behind it which effectively 'de-polarizes' the light, so it
doesn't affect camera metering systems - but the pictorial effect should
be identical to a linear polariser.
Light from the sky is most polarised 90 degrees away from the sun, and
least polarised opposite the sun in the sky, so lenses with a field of
view much greater than 90 degrees will show the variations in sky light
polarisation quite strongly, pretty much wherever they're pointed. Only
way to avoid the effect is not to use a polarizer, I think. Velvia
hardly needs a polariser to give you deep, deep blue skies, so using
that could be the best suggestion.
Roger
Piers Hemy wrote:
I think Bill did a good job of explaining the theory James, so I won't
repeat it. But I will suggest that you try a circular polarizer against a
linear polarizer, because it *may* have a less pronounced effect. I do not
recall ever seeing banding with a 17mm using a circular polarizer - but
maybe I either wasn't looking, or didn't have the scene framed so as to
include the banded area^. Best UK price I have found on circular polarizers
is at Denton Photo Optics - they advertise in AP.
Piers
^ Though I tend to have too much sky rather than too little - the reason for
having the 17mm.
NB "the reason for" not "the result of" ;-)
-----Original Message-----
From: owner-olympus@xxxxxxxxxxxxxxx [mailto:owner-olympus@xxxxxxxxxxxxxxx]
On Behalf Of James Royall
Sent: 19 December 2003 15:24
To: olympus@xxxxxxxxxxxxxxx
Subject: [OM] 24mm and polariser
I finally have a 24mm 2.8 in my possession after about four months of
various problems. I'll be getting to grips with it over the holidays during
the 8 hours of light that we get at this time of year in the UK (I'm sure
it's a lot more than some on the list, but still seems mighty short to me -
do we have anyone north of the Arctic Circle?). I seem to remember someone
saying that polarisers can be problematic with this focal length as enough
sky can be captured that the darkening of the sky is seen as a band, rather
than a uniform effect. Is this right?
James
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